Otto Edler von Graeve (July 22, 1872 - ?) was a German divining rod proponent.
He was born on July 22, 1872 to Emil Edler von Graeve (1826–1904). He was a Major in the Prussian army. In 1913 he published a manuscript on dowsing. He came to the United States on January 27, 1914 aboard the USS George Washington through New York City on his way to Vancouver to divine for radium.